Improvement in cocks



J. DEWRANCE 8 J. MALLINSON. COCKS.

Patented 0ct.2,187'7.

MPEI'ERS, FHOTO-LITMOGRAPHER. WASHINGTON. D C.

which improvements are fully set forth in the following specification,reference being had to -the construction of cocks the tightness of 'nthe contrary direction. @i

UNITED STATES PATENT OFFICE.

-JOHN DEwRANcE, OE 176 GREAT DOvER sTREET BOROUGH, AND JAMES MALLrNsoN,OE wELwrN, ENGLAND.

IMPROVEMENT IN ooo-Ks.

Speciication'forming part of Letters Patent No. 195,707, dated October2, 1877; application iiled August 24, 1877; patented in England,November 22, 1876, for fourteen years.

To all 'whom it may concern:

Be it known that we, JOHN DEwRANcE, of 176 Great Dover Street Borough,in the county of Surrey, and J AMES MALLINsON, of Welwyn, in the countyof Herts, England, have invented new and useful Improvements in Cocks,

the accompanying drawings.

The object of our invention is to improve which is wholly dependent onthe introduction of packing, and in no wise upon the t of the metallicparts. English Letters Patent for this invention were granted usNovember 22,1876, No. 4,540.

Figure 1 is a vertical section, and Fig. 2 is a horizontal section, of acock constructed according to our invention. a is the shell, b is theplug, and c c are f glands. Thepacking is appliedin grooves al a,formedI in the shell at right angles to the direction of l the low of thefluid, and these grooves open into annular spaces a2 a2, running aroundthe shell, one above and the other below the waf ter-ways. The plug b istaper in the opposite direction from that which is usual in plug-taps,the handle or instrument by which the plug is turned being applied atthe smaller end of the plug. This arrangement is more convenient forapplying the packing than ii' the taper were ough hemp or other packingmay be used. The packing, after being well rammed into th grooves andspaces, is compr ssed by means of the glands c c. These glan s compressthe packing especially at the ends of the plug, and the packing,together with the form ot the gland, prevents the plug from being forcedinto rubbing contact with the shell.

In order to prevent the current of steam, water, or other fluid rushingagainst the packing when the cocks are partly opened, we make thedistance between the edge of the waterway and the edge of the recess inthe shell a little greater than the width of the water-way.

We employ asbestus as the packing, al;

By this means the current is entirely cut od while the way in the plugis passing the packing. These wide marginal spaces or surfaces betweenthe water way and the packinggrooves are in the drawing marked a3. Asthe way or peripheral opening in the plug, as shown, corresponds inwidth with that of the shell, it will be seen that it is also of a lesswidth than said marginal spaces.

Fig. 3 is a vertical section of another cock constructed according toour invention. Fig. 4 is a horizontal section, Fig. 5 is an endelevation, and Fig. 6 is a plan, of the same.

In this cock, in order to reduce the enlargement of size which theprovision of the wide marginal spaces a3 entails, we make the plug witha stop, and to work backward and forward a little over a quarter of arevolution. The stop upon the plug is marked b', and there is acorresponding stop or shoulder, c1, upon the gland.

It will be observed that in this cock the wide marginal spaces a3 at thesides of the waterway are provided on one side only ofthe inlet and theoutlet, respectively, being` thus diagonally opposite each other at thesides of the waterway, so that for a given width of water-way the cockis of smaller diameter than when the plug is allowed to turn both ways,or all round. We also provide for the opening and closing of the cocks atoothed quadrant, d, iitted on the plug, and a worm, c, mounted on anaxis V carried by the shell, and actuated by a hand wheel or lever. Bythese means the plug may be turned as slowly as may be desired, and theshock which results from the sudden closing of cocks upon water-pipes isavoided.

To adjust the working of the larger sizes of cocks, we sometimes insertinto the bottom gland a regulating-screw, c2, with a lock-nut. The plugis supported upon the end of the screw, and as this is adjustable theplug can be eased off its bearing without slackening the gland. Wesometimes introduce an india-rubber ring on the lower gland, at c3, asan eXtra security against leakage.

It will be observed that in this cock the glands are applied with bolts,and in Figs. 1 and 2 they are shown screwed into their places. They maybe made either way.

Having thus described the nature of our said invention, and the mannerof performing the same, We would have it understood that We claim- 1.The packed cock, constructed with the wide marginal spaces a3 at thesides of the water-way, so that the packing may never be exposed to thecurrent of the uid, substantially as hereinbefore set forth.

2. The combination, substantially as hereinbefore set forth, of theplug, the shell, and the groove-packing at right angles to the iiow ofthe fluid, arranged at a distance from the edge of the fluid-way in theshell greater than the width of said Way, whereby the current isentirely cut off While the way in the plug is passing thegroove-packing, and the packing thus protected.

JOHN DEWRANCE. JAMES MALLIN SON.

Witnesses:

G. B. WARREN, JN0. DEAN,

No. 17 Gracechm'ch Street, London.

